Introductio ad Quadraturam Curvarum
(Introduction to the Quadrature of Curves)
by Isaac Newton

The Introductio ad Quadraturum Curvarum is the
introduction that Newton wrote to one of two mathematical
treatises appended to the first edition of his
Opticks, published in 1704. These mathematical
treatises were republished in 1711, in Analysis per
Quantitatum Series, Fluxiones, ac Differentias, cum Enumeratione
Linearum Tertii Ordinis, edited by William Jones.

The Latin text available here is taken from this edition of 1711.
Also available is a translation into English made by John Harris
and published in the second volume of his Lexicon
Technicum, published in 1710.